Improvement in grain-screens



J. c. mason.

GRAIN-SCREEN.

N o 174 8 Z8 Patents d March 14, 18 7 6 INVENTOR WITNESSES W5 N-PETES.FUOTO-LITHOGRAPRER WASMNGTON U C v ATTORNEYS,.

STATES JOHN C. LEESON,

OF LEON, IOWA.

IMPROVEMENT IN GRAIN-SCREENS.

Specification t'ormingpart of Letters Patent No. 174,828, dated March14, 1876; application filed February 25, 1676.

To all whom it may concern:

Be it known that I, JOHN G. LEESON, of Leon, in the county of Decaturand State of Iowa, have invented a new and valuable Improvement inGrain-Screens; and I do hereby declare that the following is a full,clear, and exact description of the con struction and operation of thesame,'reference being had to the aimexed drawings, making a part of thisspecification, and to the letters and figures of reference markedthereon.

Figure lot the drawings is a representation of a plan view of my screen,and Fig. 2 is afront view of the same. Fig. 3 is a longitudinal verticalsectional view thereof.

This invention has relation to screens for separating grain, oats, &c.,from their impurities; and the nature of my invention consists in theemployment of crimped wire, as will be hereinafter explained.

Prior to my invention wire has been crimped for the purpose of screeninggrain; butI am not aware that separated crimped wires have been employedin the manner which I will hereinafter explain.

In the annexed drawings, A designates the frame of my screen, which mayreceive motion laterally or longitudinally, or both. To this frame Iattach wires B of any suitable diameter, which are crimped orcorrugated, and which are secured at their ends to the frame in anysuitable manner. The wires are arranged side by side in parallel lines,leaving suitable spaces between them, respectively, for the passage ofthe screened grain downward, and the curves of each wire are adapted tofit the curves of its fellow, in the manner represented on the drawings,leaving no corners or cross-wires for the lodgment of any sub stancethereon whatever.

It will be obvious from what I have above said that my riddle will notclog, for the reasons, first, that all of the wires are on the sameplane; second, that there are no crossed Wires; third, that the anglesof the wire with respect to a transversed line intercept each other;fourth, in a given length of Wire there is greater vibration than insingle straight wires, which necessarily shakes through the .wider thanits upper or receiving end, the

wires thereof gradually diverging from the top to the bottom, asrepresented on the drawings.

This method of construction is designed to provide for a more readypassage for the grain through the screen toward the bottom than at thetop. It is well known that straw, chaff, and grain are first deliveredupon the screen near its top in a body, and that straw will often fallupon it endwise. N ow, if the interstices of the wires be large enough,the straw falling upon it endwise will pass through hence the necessityof making the spaces between the wires less in size at the top than atthe bottom. When the straw has assumed a horizontal position upon thescreen it will easily be carried downward over the enlarged spaces, andpassed off at the foot of the screen.

I usually construct the lower end or foot of the screen in such mannerthat it shall form grooves in the frame on a line with the wires, asshown in the drawings. This method of construction is designed to affordready means for the passage of the straw and chaff from the screen.

In the accompanying drawings the frame proper is marked A, thecorrugated wires B, and the grooved foot of the frame 0.

What I claim as new, and desire to secure by Letters Patent, is i l. Agrain-screen composed of a series of parallel corrugated wires arrangedin thesame plane, substantially as shown and described.

2. In a grain-screen, the grooved foot-piece G, constructed andarranged, with relation to I the wires, substantially as specified.

In testimony that I claim the above I have hereunto subscribed my namein the presence of two witnesses.

JOHNO. LEESON. Witnesses:

A. DILSAVER, J. L. HARVEY.

